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Flashcards in Digestive system Deck (19):
1

What re the functions of the digestive system?

ingestion
mastication
deglutition (swallowing)
digestion
segmentation (mixing of food with digestive system)
absorption
peristalsis
defecation

2

What is deglutition?

swallowing

3

How long is the alimentary canal?

30' 22' in living human

4

what is the name for the oral cavity?

buccal

5

how many pairs of salivary glands?

3

6

gut

generally refers to developing stomach in embryo

7

where is the meissner's nerve plexus?

submucosa

8

where are palatal rugae?

hard palate, determine direction of food in the oral cavity, serve as friction ridges

9

What is the uvula there for?

measure the size of the soon to be swallowed bolus

10

What about salivary glands?

parotid glands - largest and is below and in front of ear

mumps causes swelling of these

submandibular - inferior to mandible and about midway on inside of jaw

sublingual - on floor of mouth and under tongue

produces salivary amylase

11

heterodont/ diphyodont

more than one type of tooth morphology

teeth sit in alveoli

humans have two sets of teeth - 20 milk teeth (6mos. 2.5 yrs)
32 permanent teeth (replacement 6-17)
wisdom teeth (age 17-25)

12

dental formula

types, numbers, positions of teeth

deciduous formula - 12/2, C1/1, DM 2/2 = 20 teeth

permanent formula - I2/2, C1/1, P2/2, M3/3= 32 teeth

13

gut brain

enteric nerve plexuses that regulate digestive activity all along the tract

14

the oral mucosa secretes ____ which keep the mouth relatively healthy most of the time

defensins

15

parietal cells

secrete HCl

16

chief cells

pepsin (zymogen is pepsinogen) and lipases (responsible for 15% of fat digestion)

17

Besides the obvious, what is the life dependent acton of the stomach?

secreting intrinsic factor, necessary for maturation of RBC's, pernicious anemia results without it

18

triggered by aroma, taste, sight, or thought of food; is suppressed if we are depressed or have no appetite

cephalic reflex, conditioned reflex

19

bilirubin

pigment from the waste of broken-down erythrocytes